{"title":"Ungrouped Achondrites","description":"\u003cp\u003eUngrouped achondrites are differentiated stony meteorites that do not match any established achondrite group. They come from parent bodies that have not yet been linked to a recognized clan, making each one a window into an otherwise unknown asteroid or planetesimal. Unless specifically stated in the listing, specimens in this collection are Meteoritical Bulletin classified.\u003c\/p\u003e\n\n\u003ch2\u003eHow we verify ungrouped achondrites are real\u003c\/h2\u003e\n\u003cp\u003eEvery specimen is tied to a Meteoritical Bulletin entry, the official global registry of classified meteorites maintained by the Meteoritical Society. Ungrouped status itself is assigned through formal classification: an accredited laboratory measures oxygen isotopes, mineralogy, and trace elements and determines that the specimen does not fit any known group. The Bulletin record is the definitive confirmation. Read more: \u003ca href=\"\/pages\/meteoritical-bulletin-explained\"\u003eThe Meteoritical Bulletin Explained\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eWhy ungrouped specimens matter\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eUnique parent bodies.\u003c\/strong\u003e Each ungrouped achondrite likely represents a distinct asteroid or planetesimal not sampled by any other known meteorite, giving collectors and researchers a piece of an otherwise unrepresented world.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eScientific value.\u003c\/strong\u003e Ungrouped specimens often drive the discovery of new groups. Several meteorite groups recognized today began as a single ungrouped specimen that was later joined by pairs and clan members.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRarity.\u003c\/strong\u003e Because ungrouped status requires that no peer specimens exist, these meteorites are by definition rare. Many are known from a single recovered mass.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does ungrouped mean?\u003c\/strong\u003e Ungrouped means the specimen has been classified as an achondrite but does not match the chemistry or mineralogy of any established group such as HED, ureilite, aubrite, lunar, or Martian. Read more: \u003ca href=\"\/pages\/what-is-an-achondrite\"\u003eWhat Is an Achondrite?\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow can I tell an ungrouped achondrite is real?\u003c\/strong\u003e The Meteoritical Bulletin entry is the definitive proof. Each entry includes the laboratory that performed the classification, the data that established ungrouped status, and the type specimen mass. Read more: \u003ca href=\"\/pages\/how-can-you-tell-if-a-meteorite-is-real\"\u003eHow Can You Tell if a Meteorite Is Real?\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre ungrouped achondrites magnetic?\u003c\/strong\u003e It depends entirely on the parent body. Some ungrouped achondrites contain free metal and are weakly magnetic, others contain none and show no magnetic response. Read more: \u003ca href=\"\/pages\/are-meteorites-magnetic\"\u003eAre Meteorites Magnetic?\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre ungrouped achondrites a good investment?\u003c\/strong\u003e Specimens that later become type material for newly recognized groups can appreciate substantially. Most ungrouped achondrites remain niche, scientifically interesting collectibles. Read more: \u003ca href=\"\/pages\/how-much-do-meteorites-cost\"\u003eHow Much Do Meteorites Cost?\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these specimens authenticated?\u003c\/strong\u003e Unless otherwise noted, every ungrouped achondrite here has a Meteoritical Bulletin record and ships with a Treasure Coast Meteorite Co. certificate of authenticity.\u003c\/p\u003e\n\n\u003cp\u003eSee also: \u003ca href=\"\/collections\/hed-meteorites\"\u003eHED Meteorites\u003c\/a\u003e · \u003ca href=\"\/collections\/lunar-meteorites\"\u003eLunar Meteorites\u003c\/a\u003e · \u003ca href=\"\/collections\/martian-meteorites\"\u003eMartian Meteorites\u003c\/a\u003e · \u003ca href=\"\/collections\/stony-meteorites\"\u003eStony Meteorites\u003c\/a\u003e · \u003ca href=\"\/pages\/types-of-meteorites\"\u003eTypes of Meteorites\u003c\/a\u003e · \u003ca href=\"\/pages\/are-meteorites-illegal-to-own\"\u003eAre Meteorites Illegal to Own?\u003c\/a\u003e\u003c\/p\u003e","products":[{"product_id":"bir-ounane-001-achondrite-prim-ungrouped-slice-w-coa-6-46g-rare-1-of-16-classifications","title":"Bir Ounane 001 Achondrite-prim Meteorite Slice, Ungrouped, 6.46g, Polished Primitive Crust","description":"\u003ch2\u003ePrimitive achondrite from early planetary evolution\u003c\/h2\u003e\n\u003cp\u003eThis 6.46g polished slice captures material from the earliest stages of planetary differentiation. Bir Ounane 001 represents a transitional state between chondritic and fully differentiated material, preserving textures from incomplete melting and separation processes that occurred in the solar system's first million years. The polished surface reveals the fine-grained matrix and subtle mineral variations characteristic of primitive achondrites, offering direct evidence of how planetesimals evolved from undifferentiated rock into layered worlds.\u003c\/p\u003e\n\u003cp\u003eClassified as Achondrite-prim with no established group affiliation, this meteorite occupies a scientific middle ground. The specimen shows neither the chondrule-rich structure of primitive chondrites nor the clean crystalline texture of fully evolved achondrites. Instead, the slice displays a complex assemblage that records partial differentiation, the interrupted transformation of primordial material under thermal and gravitational forces.\u003c\/p\u003e\n\u003ch2\u003eStructure and features\u003c\/h2\u003e\n\u003cp\u003eThe polished surface exposes a fine-grained groundmass punctuated by mineralogical variations that reflect incomplete separation of silicate phases. Unlike the coarse crystals seen in eucrites or the metallic networks of differentiated bodies, this slice shows textural heterogeneity consistent with material that experienced heating sufficient to begin recrystallization but insufficient to complete planetary layering. Small-scale variations in reflectivity across the polish indicate compositional gradients frozen during early thermal processing.\u003c\/p\u003e\n\u003cp\u003eThe slice preparation emphasizes these subtle structural details. Polishing reveals mineral boundaries and melt features that would remain invisible in a natural state specimen. The thin profile allows transmitted light examination, though the opacity and fine grain size limit this technique compared to thinner petrographic sections.\u003c\/p\u003e\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003ePrimitive achondrites represent a rare window into interrupted differentiation. While most meteorite parent bodies either remained completely primitive (chondrites) or differentiated fully into core-mantle-crust structures (producing irons, stony-irons, and evolved achondrites), a small population of bodies experienced intermediate thermal histories. Bir Ounane 001 belongs to this scientifically valuable category, showing evidence of metamorphism and partial melting without complete magmatic processing.\u003c\/p\u003e\n\u003cp\u003eThe ungrouped classification indicates this material does not match the chemical or isotopic signatures of established meteorite clans. Among approximately 75,000 classified meteorites, only sixteen carry the Achondrite-prim designation, placing Bir Ounane 001 within an exceptionally small statistical cohort. This scarcity reflects both the rarity of primitive achondrite parent bodies and the difficulty of recognizing these meteorites in the field, where their appearance can resemble terrestrial rocks. Collectors seeking comprehensive representation of meteorite diversity will find this classification essential, as it documents a transitional stage that most solar system bodies bypassed entirely. For broader meteorite classification context, see \u003ca href=\"\/pages\/learn-about-meteorites\"\u003eLearn About Meteorites\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Yes. Bir Ounane 001 is classified in the Meteoritical Bulletin as Achondrite-prim (ungrouped). You can verify this classification through the \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Bir%20Ounane%20001\u0026amp;sfor=names\" rel=\"noopener\" target=\"_blank\"\u003eMeteoritical Bulletin database\u003c\/a\u003e. This specimen includes a certificate of authenticity documenting its provenance and classification status.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does Achondrite-prim mean?\u003c\/strong\u003e The designation indicates a primitive achondrite, a meteorite that experienced thermal processing beyond the chondritic state but did not undergo complete differentiation into distinct planetary layers. These meteorites preserve evidence of early, incomplete melting and recrystallization that occurred during planetesimal formation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is this meteorite ungrouped?\u003c\/strong\u003e Ungrouped status means Bir Ounane 001's chemical and isotopic composition does not match any established meteorite group. This classification reflects either a unique parent body or insufficient material for comprehensive analysis. Ungrouped meteorites often represent small asteroids that contributed few specimens to Earth's meteorite collection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included with this specimen?\u003c\/strong\u003e You receive the 6.46g polished slice and a certificate of authenticity. No display stand is included unless separately confirmed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow rare are primitive achondrites?\u003c\/strong\u003e Extremely rare. Only sixteen meteorites carry the Achondrite-prim classification among tens of thousands of classified falls and finds. This scarcity makes specimens from this group particularly valuable for comprehensive meteorite collections.\u003c\/p\u003e\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eBir Ounane 001 addresses a specific gap in systematic meteorite collections. Most collectors accumulate representatives of common chondrite groups and familiar achondrites like eucrites and diogenites, but primitive achondrites receive disproportionately little attention despite their scientific importance. The sixteen-meteorite cohort means acquiring any Achondrite-prim specimen requires deliberate effort, these do not appear regularly in dealer inventories.\u003c\/p\u003e\n\u003cp\u003eThis 6.46g slice offers entry into primitive achondrite collecting at an accessible size. The polished preparation maximizes visibility of internal features while maintaining a specimen large enough for clear visual examination without magnification. For collectors building taxonomically complete collections, this piece fills a classification slot that may not appear again for months or years. Those focusing specifically on ungrouped meteorites or early differentiation processes will find this specimen directly relevant to both themes. Explore related differentiated specimens in our \u003ca href=\"\/collections\/ungrouped-achondrites\"\u003eUngrouped Achondrites\u003c\/a\u003e collection, or examine other primitive material in our \u003ca href=\"\/collections\/stony-meteorites\"\u003eStony Meteorites\u003c\/a\u003e collection.\u003c\/p\u003e\n\u003cp\u003eMeteoritical Bulletin entry: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Bir%20Ounane%20001\u0026amp;sfor=names\" rel=\"noopener\" target=\"_blank\"\u003eBir Ounane 001\u003c\/a\u003e | Classification: Achondrite-prim | Find, Mali, 2022\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":44755658506287,"sku":"BIR-OUNANE-001-6.46G-SLICE","price":95.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/bir-ounane-001.png?v=1780155729"},{"product_id":"ksar-ghilane-022-9-07g-ungrouped-achondrite-meteorite-end-cut-slice","title":"Ksar Ghilane 022 Ungrouped Achondrite Meteorite End Cut, Achondrite-ung, 9.07g, Augite-Dominant Interior","description":"\u003ch2\u003eAugite-rich igneous texture in a 9.07g end cut\u003c\/h2\u003e\u003cp\u003eThis 9.07-gram end cut from Ksar Ghilane 022 exposes an interior dominated by coarse augite crystals that formed through differentiated melting processes. The slice reveals the mineral assemblage that distinguishes this ungrouped achondrite: predominantly equant augite grains averaging 1.5 millimeters across, interspersed with minor enstatite and accessory phases including chromium-bearing troilite, daubreelite, alabandite, and manganese-iron oxide. Secondary calcite veins crosscut the primary igneous texture.\u003c\/p\u003e\u003cp\u003eThe end cut format preserves one natural exterior surface while exposing a cross-section through the specimen's interior structure. The polished face allows direct observation of grain boundaries and the spatial relationships between augite, enstatite, and sulfide phases. This presentation makes the specimen particularly effective for examining the petrographic characteristics that place Ksar Ghilane 022 outside established achondrite classification schemes.\u003c\/p\u003e\u003ch2\u003eMineral assemblage and crystallization history\u003c\/h2\u003e\u003cp\u003eThe mineral chemistry recorded in the Meteoritical Bulletin confirms augite with ferrosilite content near 0.0 to 0.1 and wollastonite ranging from 39.4 to 42.3. Enstatite shows ferrosilite around 0.1 and wollastonite between 0.9 and 3.6. These compositions indicate crystallization from a magma that underwent significant fractionation, producing calcium-rich pyroxene as the dominant phase while retaining only minor orthopyroxene.\u003c\/p\u003e\u003cp\u003eThe accessory sulfide assemblage includes Cr-troilite, daubreelite, alabandite, and manganese-iron oxide, representing late-stage crystallization products. The presence of secondary calcite veins indicates post-crystallization alteration, likely during terrestrial weathering after the meteorite's fall to Earth. The combination of igneous minerals and terrestrial alteration features provides insight into both the specimen's formation environment and its history since arriving on our planet.\u003c\/p\u003e\u003ch2\u003eScientific context\u003c\/h2\u003e\u003cp\u003eUngrouped achondrites represent differentiated asteroidal material that cannot be assigned to known achondrite families. These meteorites formed through partial or complete melting of their parent bodies, producing igneous rocks with mineral assemblages distinct from both primitive chondrites and classified achondrite groups. Ksar Ghilane 022's augite-dominated composition, coupled with its specific pyroxene chemistry and accessory phases, sets it apart from eucrites, angrites, and other established achondrite classifications.\u003c\/p\u003e\u003cp\u003eThe specimen's oxygen isotope data places it outside the isotopic fields occupied by known achondrite groups, confirming its ungrouped status. This isotopic signature, combined with the unusual mineral assemblage, indicates formation on a differentiated asteroid with a distinct evolutionary history. Each ungrouped achondrite potentially represents material from a different parent body, making these specimens critical for understanding the diversity of igneous processes that occurred across the early Solar System. Collectors interested in differentiated meteorites can explore our complete selection at \u003ca href=\"\/collections\/ungrouped-achondrites\"\u003eUngrouped Achondrites\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Ksar Ghilane 022 is officially classified in the Meteoritical Bulletin as Achondrite-ung. You can verify this classification at \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Ksar%20Ghilane%20022\u0026amp;sfor=names\" target=\"_blank\" rel=\"noopener\"\u003eMeteoritical Bulletin Database\u003c\/a\u003e. This specimen includes a certificate of authenticity from Treasure Coast Meteorite Co.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does \"ungrouped achondrite\" mean?\u003c\/strong\u003e An ungrouped achondrite is a differentiated igneous meteorite that does not fit into any established achondrite classification scheme. The mineral assemblage, chemistry, and oxygen isotopes distinguish it from eucrites, diogenites, angrites, and other known groups, indicating it likely originates from a unique parent body.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with this specimen?\u003c\/strong\u003e You receive the 9.07-gram end cut slice and a certificate of authenticity. No display stand is included with this specimen.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are augite and enstatite?\u003c\/strong\u003e Augite and enstatite are both pyroxene minerals that form in igneous environments. Augite is a calcium-rich clinopyroxene that crystallizes at relatively high temperatures, while enstatite is a magnesium-rich orthopyroxene. The dominance of augite over enstatite in this specimen indicates the magma chemistry favored calcium-rich pyroxene during crystallization.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy is the oxygen isotope composition significant?\u003c\/strong\u003e Oxygen isotope ratios act as a fingerprint for identifying parent bodies. Each asteroid or planetary body has a characteristic oxygen isotope signature that reflects conditions during its formation. Ksar Ghilane 022's oxygen isotopes fall outside the ranges occupied by known achondrite groups, providing strong evidence that it formed on a previously unsampled differentiated asteroid.\u003c\/p\u003e\u003ch2\u003eDisplay and collection value\u003c\/h2\u003e\u003cp\u003eThe 9.07-gram size provides substantial hand specimen presence while remaining accessible for collectors building comprehensive achondrite collections. The end cut format offers both an exterior surface and a polished cross-section, allowing examination of both weathering features and internal structure. The coarse grain size makes individual augite crystals easily visible, providing a clear demonstration of the igneous texture that characterizes differentiated asteroidal material.\u003c\/p\u003e\u003cp\u003eUngrouped achondrites hold particular significance for collectors focused on parent body diversity. While classified achondrites like eucrites and angrites are well-represented in collections, ungrouped specimens offer the opportunity to own material from asteroids not otherwise represented in meteorite collections. This specimen documents a distinct differentiation history, mineral chemistry, and oxygen isotope signature that together define a separate lineage among differentiated Solar System bodies.\u003c\/p\u003e\u003cp\u003eMeteoritical Bulletin entry: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Ksar%20Ghilane%20022\u0026amp;sfor=names\" target=\"_blank\" rel=\"noopener\"\u003eKsar Ghilane 022\u003c\/a\u003e | Classification: Achondrite-ung | Find, Tunisia, 2023\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":44863680675887,"sku":"KSAR-GHILANE-022-9.07G-ENDCUT","price":450.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/IMG_7642.heic?v=1768329509"},{"product_id":"ksar-ghilane-022-2-33g-ungrouped-achondrite-extremely-rare-meteorite-slice","title":"Ksar Ghilane 022 Ungrouped Achondrite Meteorite Slice, achondrite-ung, 2.33g, Augite-Dominated Matrix","description":"\u003ch2\u003eAugite-rich specimen from an unclassified parent body\u003c\/h2\u003e\n\u003cp\u003eThis 2.33-gram slice preserves a matrix dominated by equant augite crystals averaging 1.5 millimeters across, with subordinate enstatite and scattered accessory phases including chromian troilite, daubreelite, and alabandite. The rock crystallized from a melt on a differentiated asteroid whose identity remains unknown. Secondary calcite veining crosses the specimen, recording later aqueous alteration or terrestrial weathering. The texture and mineral assemblage set Ksar Ghilane 022 apart from established achondrite groups, making it a reference sample for comparative planetology.\u003c\/p\u003e\n\u003cp\u003eRecovered in Tunisia in 2023, this material reached Earth after an unknown duration in space. The slice format exposes the internal structure, showing the crystalline fabric that formed as magma cooled within the crust or mantle of a small planetary body. No other meteorite shares this exact combination of pyroxene chemistry and accessory mineralogy, placing Ksar Ghilane 022 in a class by itself.\u003c\/p\u003e\n\u003ch2\u003ePyroxene assemblage and accessory phases\u003c\/h2\u003e\n\u003cp\u003eAugite comprises the bulk of the specimen, with compositional ranges of Fs ~0.0-0.1 and Wo ~39.4-42.3. This calcium-rich pyroxene indicates crystallization from a basaltic melt at temperatures consistent with shallow magmatic environments. Enstatite grains, though minor, exhibit Fs ~0.1 and Wo ~0.9-3.6, suggesting localized variations in melt chemistry or later recrystallization.\u003c\/p\u003e\n\u003cp\u003eAccessory sulfides include chromian troilite and daubreelite, both common in reduced igneous systems. Alabandite, a manganese sulfide, and an Mn-Fe oxide phase point to elevated manganese activity during crystallization. These phases typically form in oxygen-poor environments where sulfur and metal dominate over silicate melts. The calcite veins cutting the matrix formed after the rock solidified, likely during terrestrial residence or during a low-temperature aqueous event on the parent body.\u003c\/p\u003e\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eAchondrites form when asteroid interiors melt and differentiate, separating metal cores from silicate mantles and crusts. Most achondrites fall into established groups linked to known parent bodies: eucrites and diogenites trace to asteroid 4 Vesta, angrites represent a distinct basaltic reservoir, and aubrites formed under extreme reduction. Ungrouped achondrites like Ksar Ghilane 022 document differentiation events on bodies that have not been sampled repeatedly or whose fragments have not survived in sufficient numbers to define a class.\u003c\/p\u003e\n\u003cp\u003eThe oxygen isotope data for Ksar Ghilane 022 do not match any known achondrite group, confirming its orphan status. This suggests the parent body either contributed few meteorites to Earth's collection or was geologically heterogeneous enough that individual samples vary widely. Understanding these outliers refines models of early solar system processes, particularly the diversity of melting and crystallization conditions across the asteroid belt. For further background on meteorite classification and formation, see \u003ca href=\"\/pages\/learn-about-meteorites\"\u003eLearn About Meteorites\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Ksar Ghilane 022 is classified as achondrite-ung in the Meteoritical Bulletin Database. Each specimen ships with a certificate of authenticity from Treasure Coast Meteorite Co. You can verify the classification at \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Ksar%20Ghilane%20022\u0026amp;sfor=names\" target=\"_blank\"\u003eMeteoritical Bulletin: Ksar Ghilane 022\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does \"ungrouped achondrite\" mean?\u003c\/strong\u003e The classification indicates the meteorite formed through igneous differentiation on an asteroid but does not match the mineralogy, chemistry, or oxygen isotopes of any established achondrite group. It represents material from a parent body not yet linked to other known meteorites.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included with this specimen?\u003c\/strong\u003e The listing includes the 2.33-gram slice and a certificate of authenticity. No display stand is included unless separately noted.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is the parent body unknown?\u003c\/strong\u003e Most achondrite groups are defined by multiple falls or finds with shared characteristics. Ksar Ghilane 022 has a unique oxygen isotope signature and pyroxene assemblage, meaning no other meteorite has been found from the same source. This isolates it scientifically and increases its research value.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the secondary calcite veins?\u003c\/strong\u003e Calcite is a carbonate mineral that precipitates from water. The veins cutting this specimen likely formed on Earth after the meteorite fell, though some achondrites also show evidence of aqueous alteration on their parent bodies. The presence of calcite does not affect the primary igneous texture or classification.\u003c\/p\u003e\n\u003ch2\u003eWhy collectors seek ungrouped achondrites\u003c\/h2\u003e\n\u003cp\u003eUngrouped specimens represent fragments of asteroids that contributed few or no other samples to the terrestrial meteorite collection. Each one documents a unique thermal and chemical history, making them irreplaceable for comparative studies of planetary differentiation. Collectors value these meteorites for their scientific isolation and the questions they pose about the diversity of small-body geology.\u003c\/p\u003e\n\u003cp\u003eThis 2.33-gram slice balances portability with visual detail, preserving the augite-dominated matrix and accessory phases in a format suited to both display and close examination. The slice cut exposes the internal structure without requiring destructive sampling, making it accessible for educational or curatorial purposes. For additional ungrouped specimens and other differentiated materials, see the \u003ca href=\"\/collections\/ungrouped-achondrites\"\u003eUngrouped Achondrites\u003c\/a\u003e collection.\u003c\/p\u003e\n\u003cp\u003eMeteoritical Bulletin entry: \u003ca rel=\"noopener\" href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Ksar%20Ghilane%20022\u0026amp;sfor=names\" target=\"_blank\"\u003eKsar Ghilane 022\u003c\/a\u003e | Classification: Achondrite-ung | Find, Tunisia, 2023\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":44863690440751,"sku":"KSAR-GHILANE-022-2.33G-SLICE","price":115.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/ksar-ghilane-022-achondrite-meteorite-slice-capsule-display-2-33g.heic?v=1779461066"},{"product_id":"ksar-ghilane-022-1-75g-ungrouped-achondrite-extremely-rare-meteorite-slice","title":"Ksar Ghilane 022 Ungrouped Achondrite Meteorite Slice, Achondrite-ung, 1.75g, Augite-Rich Matrix","description":"\u003ch2\u003eDifferentiated material from an unknown parent body\u003c\/h2\u003e\n\u003cp\u003eThis 1.75g slice exposes a cross-section of augite-dominant matrix representing differentiated planetary crust that does not match any established achondrite group. The specimen preserves an equant crystal texture where individual augite grains average 1.5 mm across, creating a granular fabric visible throughout the slice. Minor enstatite appears interspersed among the pyroxene grains, alongside accessory phases including chromium-bearing troilite, daubreelite, alabandite, and manganese-iron oxide. Secondary calcite veining crosses portions of the matrix, recording post-formation aqueous alteration.\u003c\/p\u003e\n\u003cp\u003eThe slice format allows observation of the textural relationships between mineral phases and provides a representative sample of the meteorite's internal structure. Found in Tunisia in 2023, this specimen joined the small inventory of ungrouped achondrites that challenge existing classification frameworks.\u003c\/p\u003e\n\u003ch2\u003ePyroxene-dominated texture and mineralogy\u003c\/h2\u003e\n\u003cp\u003eAugite forms the primary mineral phase throughout this specimen, characterized by a ferrosilite content near zero (Fs ~0.0-0.1) and wollastonite component ranging from Wo ~39.4 to 42.3. These compositional values place the pyroxene in the calcic field, consistent with crystallization from a basaltic melt under conditions similar to those that produce terrestrial gabbros. The equant grain morphology indicates slow cooling rates that allowed crystals to develop isometric shapes rather than elongated or skeletal forms.\u003c\/p\u003e\n\u003cp\u003eEnstatite occurs as a minor phase with ferrosilite content near Fs ~0.1 and wollastonite ranging from Wo ~0.9 to 3.6, representing orthopyroxene that crystallized alongside the augite. Sulfide minerals include chromium-enriched troilite and daubreelite, both of which typically form during late-stage crystallization in reduced environments. Alabandite (manganese sulfide) and the manganese-iron oxide phase represent additional accessory minerals that record the availability of manganese during parent body differentiation.\u003c\/p\u003e\n\u003ch2\u003eScientific context\u003c\/h2\u003e\n\u003cp\u003eUngrouped achondrites represent meteorites that experienced complete melting and differentiation on their parent asteroids but do not share the diagnostic characteristics of established groups like HEDs, angrites, or aubrites. Each ungrouped specimen potentially samples a distinct parent body with its own thermal and compositional history. Ksar Ghilane 022's augite-rich composition and specific pyroxene chemistry distinguish it from all currently recognized achondrite families, suggesting formation on a previously unsampled differentiated asteroid.\u003c\/p\u003e\n\u003cp\u003eOxygen isotope analyses of acid-washed subsamples place this meteorite on a distinct trajectory in three-isotope space, further confirming its independent origin. The crystallization sequence preserved in this specimen, augite as the primary phase with minor orthopyroxene, indicates a basaltic composition similar to eucrites but with mineralogical and chemical signatures that prevent classification within the HED suite. Understanding the diversity of differentiated asteroids requires specimens like Ksar Ghilane 022 that expand our knowledge beyond well-studied groups. Learn more about meteorite classification and origins at \u003ca href=\"\/pages\/learn-about-meteorites\"\u003eLearn About Meteorites\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Ksar Ghilane 022 is classified in the Meteoritical Bulletin as Achondrite-ung. You can verify the classification at \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Ksar%20Ghilane%20022\u0026amp;sfor=names\" rel=\"noopener\" target=\"_blank\"\u003eMeteoritical Bulletin: Ksar Ghilane 022\u003c\/a\u003e. This specimen includes a certificate of authenticity documenting its provenance and classification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does \"ungrouped achondrite\" mean?\u003c\/strong\u003e An ungrouped achondrite is differentiated igneous rock from an asteroid that does not match the mineralogy, chemistry, or oxygen isotope signature of any established achondrite group. Each ungrouped specimen potentially represents material from a distinct parent body.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included with this specimen?\u003c\/strong\u003e This listing includes the 1.75g meteorite slice and certificate of authenticity. No display stand is included.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy are augite crystals significant in this meteorite?\u003c\/strong\u003e The dominance of augite with near-zero ferrosilite content indicates crystallization from a calcium-rich basaltic melt under reducing conditions. This mineral assemblage differs from the augite chemistry in HED meteorites and other achondrite groups, supporting the specimen's ungrouped status.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat caused the calcite veining?\u003c\/strong\u003e Secondary calcite veins form when aqueous fluids carrying dissolved calcium carbonate infiltrate fractures in the meteorite, typically during terrestrial weathering after the fall or find. These veins postdate the original igneous crystallization of the rock.\u003c\/p\u003e\n\u003ch2\u003eCollector significance\u003c\/h2\u003e\n\u003cp\u003eUngrouped achondrites occupy a specialized niche in collections because each specimen potentially represents a unique differentiated parent body. With only a small number of ungrouped achondrites recognized in the Meteoritical Bulletin, these specimens document asteroidal diversity beyond the major achondrite groups. This 1.75g slice provides accessible entry into this scientifically significant category at a weight suitable for study collections and educational displays.\u003c\/p\u003e\n\u003cp\u003eThe slice format exposes the augite-dominated texture and allows direct observation of the mineralogical features described in the classification documentation. For collectors building representative suites of differentiated meteorites, Ksar Ghilane 022 fills the ungrouped achondrite position with material that cannot be approximated by specimens from established groups. Browse additional differentiated meteorite types in our \u003ca href=\"\/collections\/ungrouped-achondrites\"\u003eUngrouped Achondrites\u003c\/a\u003e collection.\u003c\/p\u003e\n\u003cp\u003eMeteoritical Bulletin entry: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Ksar%20Ghilane%20022\u0026amp;sfor=names\" rel=\"noopener\" target=\"_blank\"\u003eKsar Ghilane 022\u003c\/a\u003e | Classification: Achondrite-ung | Find, Tunisia, 2023\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":44863852904495,"sku":"KSAR-GHILANE-022-1.75G-SLICE","price":90.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/ksar-ghilane-022-achondrite-meteorite-slice-capsule-1-75g.heic?v=1779460587"},{"product_id":"ksar-ghilane-022-2-11g-ungrouped-achondrite-extremely-rare-meteorite-slice","title":"Ksar Ghilane 022 Ungrouped Achondrite Meteorite Slice, achondrite-ung, 2.11g, Augite-Rich Differentiated Material","description":"\u003ch2\u003eAugite-dominated achondrite from an unidentified differentiated body\u003c\/h2\u003e\u003cp\u003eThis 2.11g slice presents a texture dominated by equant augite crystals averaging 1.5 mm in size, creating a coarse-grained mosaic visible across the cut surface. Minor enstatite appears alongside accessory phases including chromium-bearing troilite, daubreelite, alabandite, and a manganese-iron oxide assemblage. Secondary calcite veins traverse portions of the slice, recording post-crystallization alteration. The specimen represents differentiated planetary material that underwent complete melting and slow crystallization within a parent body's interior, yet its mineral chemistry and oxygen isotope signature do not match any established achondrite group.\u003c\/p\u003e\u003cp\u003eKsar Ghilane 022 was recovered from the Tunisian desert in 2023 and classified as an ungrouped achondrite based on petrographic analysis and geochemical data. The meteorite's classification reflects the fact that its composition places it outside known achondrite families, making each specimen a reference sample for comparative planetology studies. This slice preserves the original igneous texture formed during slow cooling within a differentiated asteroid.\u003c\/p\u003e\u003ch2\u003ePyroxene mineralogy and accessory phases\u003c\/h2\u003e\u003cp\u003eThe augite component shows ferroan silite values near zero (Fs ~0.0-0.1) with wollastonite content between 39.4 and 42.3, indicating calcium-rich clinopyroxene that crystallized from a basaltic melt. The subordinate enstatite phase displays similarly low iron content (Fs ~0.1) but minimal calcium (Wo ~0.9-3.6), representing orthopyroxene that formed alongside the dominant augite. This dual-pyroxene assemblage records crystallization conditions distinct from eucrites, angrites, and other common basaltic achondrites.\u003c\/p\u003e\u003cp\u003eChromium-bearing troilite and daubreelite occur as accessory sulfides, while alabandite (manganese sulfide) adds to the meteorite's trace mineral inventory. The presence of an Mn-Fe oxide phase further distinguishes this material from typical basaltic achondrites. These accessory minerals provide constraints on oxygen fugacity and sulfur activity during crystallization, offering geochemical fingerprints that separate Ksar Ghilane 022 from established achondrite groups.\u003c\/p\u003e\u003ch2\u003eDifferentiated asteroid origins and classification challenges\u003c\/h2\u003e\u003cp\u003eAchondrites form through igneous processes on differentiated parent bodies where internal heating caused complete melting and subsequent crystallization. Ksar Ghilane 022's coarse pyroxene texture indicates it crystallized slowly at depth within such a body, likely as part of a cumulate pile or shallow intrusion. Oxygen isotope analyses of acid-washed subsamples have been performed but plot outside the fields of known achondrite groups, supporting the ungrouped classification assigned by the Meteoritical Bulletin.\u003c\/p\u003e\u003cp\u003eThe meteorite likely originated from a small differentiated asteroid that experienced early melting during the first few million years of solar system history. Its parent body remains unidentified and may represent one of the countless asteroids disrupted by collisions over the past 4.5 billion years. Materials like Ksar Ghilane 022 expand our understanding of the diversity of differentiated bodies that formed in the early solar system, demonstrating that not all basaltic crusts and mantles followed the same evolutionary path. \u003ca href=\"\/pages\/learn-about-meteorites\"\u003eLearn About Meteorites\u003c\/a\u003e to explore how scientists classify specimens based on mineralogy and chemistry.\u003c\/p\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Yes. Ksar Ghilane 022 is classified in the Meteoritical Bulletin as achondrite-ung based on petrographic and geochemical analysis. View the official entry here: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Ksar%20Ghilane%20022\u0026amp;sfor=names\" target=\"_blank\" rel=\"noopener\"\u003eKsar Ghilane 022\u003c\/a\u003e. This specimen includes a certificate of authenticity with your purchase.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does ungrouped achondrite mean?\u003c\/strong\u003e Ungrouped achondrites are differentiated meteorites that do not fit into established classification schemes like eucrites, angrites, or aubrites. Ksar Ghilane 022's mineral chemistry and oxygen isotopes place it outside all known groups, indicating it came from a distinct parent body not represented in other meteorite collections.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with this specimen?\u003c\/strong\u003e You receive the 2.11g slice shown in the photographs and a certificate of authenticity. No display stand is included unless specifically noted in the product listing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy are augite-rich achondrites scientifically significant?\u003c\/strong\u003e Clinopyroxene-dominated achondrites like Ksar Ghilane 022 sample igneous processes on small differentiated bodies. Their mineral assemblages record cooling rates, crystallization sequences, and mantle compositions that differ from Earth and larger planetary bodies, providing comparative data for understanding early solar system differentiation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow should I store and handle this slice?\u003c\/strong\u003e Store in a dry environment away from humidity to prevent alteration of sulfide phases and secondary minerals. Handle by the edges to avoid transferring oils to the cut surface. The polished face can be gently cleaned with a soft, dry cloth if dust accumulates.\u003c\/p\u003e\u003ch2\u003eUngrouped achondrites in meteorite collections\u003c\/h2\u003e\u003cp\u003eCollectors pursuing \u003ca href=\"\/collections\/ungrouped-achondrites\"\u003eUngrouped Achondrites\u003c\/a\u003e acquire specimens that represent unsampled parent bodies, effectively holding material from asteroids not otherwise represented in terrestrial collections. Ksar Ghilane 022's recent classification and limited distribution make it a timely addition for collectors building comprehensive achondrite suites. The specimen's coarse augite texture provides visual interest under magnification, while its scientific orphan status adds research value.\u003c\/p\u003e\u003cp\u003eThis 2.11g slice offers accessible entry into ungrouped achondrite collecting without requiring significant display space. The size allows for detailed examination of pyroxene grain boundaries and accessory phases while remaining suitable for standard collection storage. As additional Ksar Ghilane 022 material reaches classification and distribution, early acquisition secures representation of this geochemically distinct fall before availability narrows.\u003c\/p\u003e\u003cp\u003eMeteoritical Bulletin entry: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Ksar%20Ghilane%20022\u0026amp;sfor=names\" target=\"_blank\" rel=\"noopener\"\u003eKsar Ghilane 022\u003c\/a\u003e | Classification: achondrite-ung | Find, Tunisia, 2023\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":44863861424175,"sku":"KSAR-GHILANE-022-2.11G-SLICE","price":105.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/IMG_7635.heic?v=1768333666"},{"product_id":"erg-chech-002-0-8g-ungrouped-achondrite-red-individual","title":"Erg Chech 002 Ungrouped Achondrite Meteorite Individual, Achondrite-ung, 0.80g, Andesitic Crust Fragment","description":"\u003ch2\u003eA fragment of the oldest volcanic crust\u003c\/h2\u003e\u003cp\u003eThis 0.80g individual preserves the andesitic composition that distinguishes Erg Chech 002 from all other achondrites in world collections. The specimen displays noticeable reddish-brown terrestrial staining across portions of the surface and interior matrix, consistent with the Saharan Desert environment where this meteorite was recovered in 2020. The Meteoritical Bulletin reports minor goethite as a secondary weathering product in EC 002 specimens, a direct result of groundwater interaction in the find location.\u003c\/p\u003e\u003cp\u003eThe surface shows the characteristic gray-green matrix typical of this meteorite's pyroxene-plagioclase assemblage, with staining concentrated in fractures and exposed interior surfaces. This individual retains its natural exterior geometry from the breakup of the parent mass during atmospheric entry or ground impact.\u003c\/p\u003e\u003ch2\u003eAndesitic mineralogy and texture\u003c\/h2\u003e\u003cp\u003eErg Chech 002 consists predominantly of plagioclase feldspar and pyroxene crystals in proportions that match terrestrial andesite, a volcanic rock type commonly found in subduction zones on Earth. This mineralogy requires formation through partial melting and fractional crystallization in a silica-rich magma system, processes that occurred on a differentiated protoplanet with a defined crust-mantle boundary.\u003c\/p\u003e\u003cp\u003eThe fine-grained texture indicates rapid cooling at or near the surface of its parent body, consistent with extrusive volcanism. This specimen preserves that crystallization history in a hand-sized fragment representing crustal geology from the first few million years of solar system formation.\u003c\/p\u003e\u003ch2\u003eScientific context\u003c\/h2\u003e\u003cp\u003eErg Chech 002 crystallized approximately 4.565 billion years ago, making it older than any other volcanic rock yet analyzed. This age predates the formation of Earth's crust by tens of millions of years. The meteorite formed on a protoplanet that achieved full differentiation into core, mantle, and crust before catastrophic disruption during the early bombardment phase of solar system evolution. No parent body has been identified; the protoplanet that produced this crust no longer exists as an intact object.\u003c\/p\u003e\u003cp\u003eThe andesitic composition indicates a complex magmatic evolution rare among differentiated asteroids, most of which produced basaltic or ultramafic crustal rocks. Erg Chech 002 demonstrates that protoplanetary volcanism in the early solar system was more geologically diverse than the surviving asteroid belt suggests. Collectors seeking specimens that document primordial planetary processes will find few examples with greater scientific significance. For comprehensive context on meteorite classification systems and formation mechanisms, see \u003ca href=\"\/pages\/learn-about-meteorites\"\u003eLearn About Meteorites\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eIs this meteorite authenticated?\u003c\/strong\u003e Erg Chech 002 is classified in the Meteoritical Bulletin as an ungrouped achondrite. Meteoritical Bulletin entry: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Erg%20Chech%20002\u0026amp;sfor=names\" target=\"_blank\" rel=\"noopener\"\u003eErg Chech 002\u003c\/a\u003e. This specimen includes a certificate of authenticity documenting its classification and provenance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does the reddish-brown staining indicate?\u003c\/strong\u003e The staining results from terrestrial weathering in the Algerian Sahara, where groundwater introduced iron-bearing minerals into fractures and porous regions of the meteorite. The Meteoritical Bulletin identifies goethite as a weathering product in EC 002 specimens. This staining does not affect the specimen's scientific integrity or primary mineralogy.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with this specimen?\u003c\/strong\u003e This listing includes the 0.80g individual meteorite and a certificate of authenticity. No display stand is included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does \"ungrouped achondrite\" mean?\u003c\/strong\u003e Ungrouped achondrites do not fit into established meteorite groups based on mineralogy, oxygen isotopes, or chemistry. Erg Chech 002's andesitic composition and ancient age distinguish it from HED meteorites, lunar samples, Martian meteorites, and all other classified achondrite groups, placing it in its own category.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy is the age of this meteorite significant?\u003c\/strong\u003e At 4.565 billion years, Erg Chech 002 crystallized within the first few million years of the solar system's existence, before most planetary bodies had completed differentiation. It represents a snapshot of crustal geology from a time period for which no other volcanic samples are available, making it the oldest known piece of planetary crust.\u003c\/p\u003e\u003ch2\u003eCollector significance\u003c\/h2\u003e\u003cp\u003eErg Chech 002 stands alone among meteorites for its combination of extreme age, andesitic composition, and protoplanetary origin. No other specimen type in private hands represents volcanic crust from the first epoch of planetary formation. The 2020 recognition of this meteorite expanded the known diversity of early solar system geology and provided the first andesitic sample from beyond Earth.\u003c\/p\u003e\u003cp\u003eThis 0.80g individual offers an accessible entry point into one of the most scientifically important meteorite finds of the 21st century. The visible weathering staining provides a documentary record of the specimen's terrestrial residence time while preserving the primary igneous texture beneath. For collectors building representative suites of achondrite types, Erg Chech 002 fills a category no other meteorite can occupy. Additional ungrouped achondrite specimens and related differentiated meteorite types are available in the \u003ca href=\"\/collections\/ungrouped-achondrites\"\u003eUngrouped Achondrites\u003c\/a\u003e collection.\u003c\/p\u003e\u003cp\u003eMeteoritical Bulletin entry: \u003ca href=\"https:\/\/www.lpi.usra.edu\/meteor\/metbull.php?sea=Erg%20Chech%20002\u0026amp;sfor=names\" target=\"_blank\" rel=\"noopener\"\u003eErg Chech 002\u003c\/a\u003e | Classification: Achondrite-ung | Find, Algeria, 2020\u003c\/p\u003e","brand":"Treasure Coast Meteorite Co.","offers":[{"title":"Default Title","offer_id":44864528384047,"sku":"ERG-CHECH-002-0.8G-INDIVIDUAL","price":80.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/files\/erg-chech-002-ungrouped-achondrite-0-8g-front-view.heic?v=1769834996"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/9724\/9839\/collections\/ungrouped-achondrites-collection.png?v=1766196469","url":"https:\/\/www.tcmeteorites.com\/collections\/ungrouped-achondrites.oembed","provider":"Treasure Coast Meteorite Co.","version":"1.0","type":"link"}